#!/bin/bash

#####################################################################
#                                                                   #
#               Cross-compiles Faust programs to VST plugins        #
#                      from : Linux or OSX                          #
#                        to : Windows 32                            #
#                       (c) Grame, 2014                             #
#                                                                   #
#####################################################################

#------------------------------------------------------------------------------
# 1/ VST SDK Should be installed somewhere
VST=/usr/local/include/vstsdk2.4
. faustpath
if [ ! -d "${VST}" ]; then
      echo "unable to locate VST SDK: VST=${VST}" 1>&2
      exit 1
fi

# these cpp files have to be compiled too
VSTSRC="$VST/public.sdk/source/vst2.x/audioeffect.cpp $VST/public.sdk/source/vst2.x/audioeffectx.cpp $VST/public.sdk/source/vst2.x/vstplugmain.cpp "

#------------------------------------------------------------------------------
# mingw crosscompiler should be installed ('mingw32' package on Ubuntu)
# It must be in the PATH and the exact prefix should be specified in
# the environment variable MINGWPREFIX

: ${MINGWPREFIX="i686-w64-mingw32-"}
CXX="${MINGWPREFIX}g++"
(which "$CXX" >/dev/null) || (echo "MingW compiler $CXX not found"; exit 1)
DLLWRAP="${MINGWPREFIX}dllwrap --target=i686-w64-mingw32"
STRIP="${MINGWPREFIX}strip"

#-----------------------------------------------------------------------------
# Compilation flags
CXXFLAGS="-std=c++11 -O3 -mfpmath=sse -msse -ffast-math -DBUILDING_DLL -Wno-multichar -Wno-write-strings"
CXXINCS=" -I$VST -I$VST/public.sdk/source/vst2.x"
EXT=".dll"

#-------------------------------------------------------------------
# Analyze command arguments :
# faust options                 -> OPTIONS
# if -omp : -openmp or -fopenmp -> OPENMP
# existing *.dsp files          -> FILES
#

#PHASE 2 : dispatch command arguments
for p in $@; do
    if [ "$p" = -omp ]; then
        if [[ $CXX == "icpc" ]]; then
            OMP="-openmp"
        else
            OMP="-fopenmp"
        fi
    fi

    if [ "$p" = -icc ]; then
        ignore=" "
    elif [ ${p:0:1} = "-" ]; then
        OPTIONS="$OPTIONS $p"
    elif [[ -f "$p" ]] && [ ${p: -4} == ".dsp" ]; then
        FILES="$FILES $p"
    else
        OPTIONS="$OPTIONS $p"
    fi
done

BINARIES=""

#PHASE 3 : Compile each dsp files in $FILES
for p in $FILES; do

    CUR=$(pwd)
    f=$(basename "$p")
    SRCDIR=$(dirname "$p")

    # creates a temporary dir
    TDR=$(mktemp -d faust.XXX)
    TMP="$TDR/${f%.dsp}"
    mkdir "$TMP"

    # compile faust to c++
    faust -i -a vst.cpp $OPTIONS "$SRCDIR/$f" -o "$TMP/${f%.dsp}.cpp" || exit

    # compile c++ to binary
    (
        cd "$TMP"

        # we need to create the .def file needed to generate the .dll
        echo "LIBRARY     ${f%.dsp}"                          > ${f%.dsp}.def
        echo "DESCRIPTION 'Faust generated VST plugin'"     >> ${f%.dsp}.def
        echo "EXPORTS     VSTPluginMain"                     >> ${f%.dsp}.def

        $CXX $CXXINCS $CXXFLAGS -c "$VST/public.sdk/source/vst2.x/audioeffect.cpp" -o audioeffect.o
        $CXX $CXXINCS $CXXFLAGS -c "$VST/public.sdk/source/vst2.x/audioeffectx.cpp" -o audioeffectx.o
        $CXX $CXXINCS $CXXFLAGS -c "$VST/public.sdk/source/vst2.x/vstplugmain.cpp" -o vstplugmain.o
        $CXX $CXXINCS $CXXFLAGS -c "${f%.dsp}.cpp" -o "${f%.dsp}.o"

        $DLLWRAP --driver-name $CXX --def ${f%.dsp}.def *.o  $LIBS -static-libstdc++ -static-libgcc -o "${f%.dsp}$EXT"
        $STRIP "${f%.dsp}$EXT"
    ) > /dev/null || exit

    cp "$TMP/${f%.dsp}$EXT" "$SRCDIR"

    # remove temporary directory
    rm -rf "$TDR"

    # collect binary file name for FaustWorks
    BINARIES="$BINARIES$SRCDIR/${f%.dsp}$EXT;"
done

echo "$BINARIES"
